Bonnet construction for self-grinding valves



L. D. COLLAR 1,761,655

BONNET CONSTRUCTION FOR SELF GRINDING VALVES June 3, 1930.

Original Filed July 18, 1928 nnr- IN VEN TOR.

ATTORNEYS.

V .a cable block reciprocated. stem block be held from revolving,keyways were formed both in the bore in which keys were disposed toPatented June 3, 1930 tim'ran s'TATss LLOYD n. COLLAR, OFBERKELEY, oAL

PATENT OFFICE v rronma, ASSIGNOR r COLLAR vALvn CORPORA- TION, 0FBERKELEY, CALIFORNIA, A CORPORATION OF CALIFORNIA.

BONNET CONSTRUCTIGN FOR- SELF-GRINDING VALVES Application filed July 18,was,

This invention relates .to valves of the so-called self-grinding typeand particularly pertains to certain improvements ,on the ,mg the flowbetween the inlet and outlet openings. The valve opening is controlledby a valve which cooperates with the seat. This valve is fitted with astem which is threaded through a stem block arranged for reciprocatingmovement but held from turning in a bonnet arranged on the valve body.This stem block bears against a compression spring which is interposedbetween the stem and an abutment'formed in the valve body. When thevalve is moved to closed when the valve abuts v tinued rotation ofthevalve stem causes axial movement ofthe stemblockagainst the action ofthe spring, causing the valve to grind on the seat. Also, whencommencingto open the valve, tl1e stem of the latter is revolvedsufliciently to move the stem block and relieve thespring before thevalve com mences to leave the seat. This of course, causes a grindingaction between the valve and seat prior'to opening the valve.

In all of these prior structures'the bonnot was formed with acylindrical counterbore within which the cylindrical stem block As it isnecessary that the the stem block and in permit the stem block toreciprocate but pre vent it fromrotating. Such a construction is anexpensive one-and it is the principal object of the present invention toimprove and simplify this construction to minimize the manufacturingcost of-the valve.

In carrying the bore in which the stem block is reciprois broached toform six. grooves longi- Serial No. 293,571.

openings'and a valve tition '16 having in'gs l1 and 12 out this'objectinto practice Renewed February 25, 1930.

" tudinally thereof of sucha disposition that the stem block maybeinanufactured of standard hexagon stock needing no machine work on itsexterior surface andthe corners of which will engage the grooves in thecable but non-rotatable therein.

One form which the invention may as sume is exemplified in thefollowingdescriptlon and illustrated by way of example in;

the accompanying drawings, in which:

Fig. 1 is a' central vertical section through a valve embodying thepreferred form of my invention.

Fig. 2 is a view in side elevation of. the

bonnet partly in section showing its construction.

Fig. 3 is a view of the inner end of. the bonnet showing the manner inwhich the bore thereof is broached to receive a--stem block formed ofstandard hexagon stock. position the stem threads through the stem blockand the latter remains stationary butagainst the seat 0011-Reterringmore particularly to the accompany ng drawings, indicates avalve body formed with an inlet opening 11 and an outlet opening 12which in the present instance are shown in axialaligmnent. The inletopening 11 communicates with'an inlet .chamber 14 and the outlet opening12 com-- municates with an outlet chamber 15. These chambers 14 and 15are separatedbya para valve opening 17 formed therethrough. This valveopening 17 'issur- .rounded by a valve seat 18 with which avalve 19cooperates. This valve 19 isfitted with a stem 20 whichextends at rightangles to theaxis of the inlet and outlet openprojecting annular flange23 whichwis of a diameterslightly-less than the exterior. di-

and coaxiallyythrough' a cy- "lindrical extension 21 formed on the valvebore so that the stem block will be reoiproend of anbonnet 22." l

ameterpf the extension 21, so that it may bear against the outer end ofthe extension 21 a when the :bonnet 22 is assembled" on? the valve body.A bonnet nut 24 is provided which may be arranged over the bonnet toabut against the flange 23 and be threaded on the extension 21 to clampthe bonnet in position.

At its outer end the bonnet 22 is formed with a packing gland structure25 to prevent leakage around the valve stem. At its inner end the bonnet22 is counterbored to provide a stem block chamber 26. This stem blockchamber after being bored is broached by means of a hexagonal breach toprovide six longitudinal grooves 27 spaced equal distances apart. A stemblock 28 of hexagonal outline is reciproeably mounted in the stem blockchamber 26 with its corners slidably engaging the grooves 27. Thisarrangement enables the stem block 28 to reciprocate in the chamber 26but prevents it from rotating.

It should be stated here that the stem block 28 is formed of standardhexagon stock and that its exterior surface need not be machinedwhilemanufacturing the valve. For example, should valves be manufacturedwherein the stem block is formed of one inch of hexagon stock a bar ofthis stock is cut into pieces of the desired length which are faced andthreaded. The bore or stem block chamber 26 is then broached with a oneinch broach which will receive the stem block. This construction enablesthe bonnet assembly to be inexpensively manufactured when compared withthe methods and constructions used hitherto and thus I have minimizedthe production cost of valves of this type.

t the inner end of the extension 21 it is formed with an inwardlyprojecting annular. shoulder 29 upon which a thrust ring 30 bears. Anexpansion spring 31 is interposed between the thrust ring 30 and thestem block 28. This type of spring is new in'the art and its advantagesare fully described and it is claimed in a copending a1 plicationentitled Valve, filed July 18, 1928, Ser. No. 293,570.

In operation of the valve it is constructed and assembled as shown inthe drawings. When the valve stem is rotated it threads upwardly throughthe stem block until the valve seats on the seat 18. During continuedrotation of the valve, the valve 19 revolves on the seat and the stemblock 28 is caused to move downwardly against the action of the spring31 causing the valve to grind on the seat with the pressure of the sprinIn opening the valve, the valve stem is revolved until the stem block 28reaches its uppermost position and thereafter the valve will comence toopen. grind on its seat both upon opening and closing the valve.

The principal feature disclosed in this Thus, the valve will presentapplication, however, is the bonnet construction. This construction as Ihave previously pointed out minimizes the cost of production of thevalve, reduces the number of parts and renders the valve more elficientin operation.

I also wish to point out that in order to disassemble the valve it isonly necessary to remove the nut 24:, enabling the entire bonnetconstruction to be removed for packing or replacements.

lVhile I have shown the preferred form of my invention, it is to beunderstood that various changes may be made in its construction by thoseskilled in the art without departing from the spirit of the invention asdefined in the appended claims.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. In a valve of the character described, a bonnet constructioncomprising a bonnet having a stem block chamber formed in the lower endthereof, said chamber being cylindrically bored and then broached toform parallel groves at spaced distances apart, a stem blockreciprocably mounted in the bore and of a shape having corners fittingthe grooves to permit the stem block to reciprocate in the chamber butto prevent it from rotating.

2. A bonnet construction for a valve of the character described, saidbonnet construction including a bonnet adapted to be clamped on a valvebody, the inner end of said bonnet being cylindrically bored and thenbroached to form a cylindrical chamber having six parallel groves atequally spaced distances apart, a stem block formed of hexagonal stockreciprocably mounted in the bore with its corners engaging the groovesto keep the block from revolving in the bonnet.

3. A valve of the character dcscribed comprising a valve body, acylindrical extension on the valve body, a bonnet having its lower endadapted to project within the cylindrical extension, a flangecircumscribing the bonnet and adapted to bear on the outer end of saidextension, a bonnet nut fitting over the bonnet and bearing against saidflange and adapted to be threaded to said extension to clamp the bonnetin position on the valve body, the inner end of said bonnet eingcylindrically bored and then broached to receive a hexagonal stem block,a hexagonal stem block reciprocably but non-rotatably fitted within saidbore.

LLOYD D. COLLAR.

